The New York Times this weekend started running a new numerical logic puzzle from Japan called KenKen next to their crossword puzzle.

It's sort of like sudoku, but with math involved. I found this web version of the game that lets you play online and get your solutions right away, without having to wait around for the New York Times.

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KenKen was developed by Japanese teacher Tetsuya Miyamoto, who founded the Miyamoto Math Classroom in Tokyo. Miyamoto uses puzzle solving about 90 minutes a week in his classroom.